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Finding the Fourth Proportional to 57.91, 79.87 and 45.61

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Solution

The fourth proportional to 57.91, 79.87 and 45.61 is: 62.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.91 : 79.87 = 45.61 : x
  2. Step 2: Convert to fraction form
    57.91/79.87 = 45.61/x
  3. Step 3: Cross multiply
    57.91x = 79.87 × 45.61
  4. Step 4: Simplify right side
    57.91x = 3,642.76
  5. Step 5: Solve for x
    x = 3,642.76/57.91
  6. Step 6: Final answer
    x = 62.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.